Attacking 'Islamic State' and the Khorasan Group: Surveying the International Law Landscape

53 Columbia Journal of Transnational Law Bulletin 1 (2014)

29 Pages Posted: 20 Nov 2014 Last revised: 29 Nov 2014

See all articles by Louise Arimatsu

Louise Arimatsu

University of Exeter; Chatham House

Michael N. Schmitt

University of Reading School of Law; Lieber Institute, USMA at West Point; Naval War College - Stockton Center for the Study of International Law

Date Written: November 18, 2014

Abstract

In October 2014, the United States and various other States commenced an air campaign against the “Islamic State” in Iraq and Syria and the Khorasan Group in Syria. The international law governing when a State may use force against non-State actors on the territory of another is generally unsettled, except when either the territorial State has granted its consent to the operations and those operations remain within the scope of the consent or the United Nations Security Council has authorized them pursuant to its U.N. Charter, Chapter VII, authority. Beyond those justifications, States remain divided as to how to lawfully respond to armed non-state actors acting independently of a State without violating the use of force prohibition in Article 2(4) of the U.N. Charter, as well as the sovereignty of the territorial State. In particular, the nature of the right to use force in self- defense in such circumstances remains hotly contested.

The current military operations against the “Islamic State” and the Khorasan Group have each been justified on different legal grounds. This article critically evaluates the legality of the respective operations to isolate the legal questions that continue to divide opinion on the use of force by States against non-State armed groups located in other States.

Keywords: islamic State, ISIS, ISIL, Syria, self-defense, use of force, Iraq, Khorasan

Suggested Citation

Arimatsu, Louise and Schmitt, Michael N., Attacking 'Islamic State' and the Khorasan Group: Surveying the International Law Landscape (November 18, 2014). 53 Columbia Journal of Transnational Law Bulletin 1 (2014), Available at SSRN: https://ssrn.com/abstract=2527697

Louise Arimatsu

University of Exeter ( email )

Streatham Court
University of Exeter
Exeter, EX4 4QJ
United Kingdom

Chatham House ( email )

10 St James's Square
London, SW1Y 4LE
United Kingdom

Michael N. Schmitt (Contact Author)

University of Reading School of Law ( email )

Whiteknights
Reading, Berkshire RG6 6AH
United Kingdom

HOME PAGE: http://https://www.reading.ac.uk/law/Staff/m-schmitt.aspx

Lieber Institute, USMA at West Point ( email )

600 Thayer Rd
West Point, NY Rhode Island 10996
United States
4016190192 (Phone)
02871-5150 (Fax)

HOME PAGE: http://https://www.reading.ac.uk/law/Staff/m-schmitt.aspx

Naval War College - Stockton Center for the Study of International Law ( email )

686 Cushing Road
Newport, RI 02841
United States

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